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merge
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| from collections import Counter | |
| import hypothesis.strategies as st | |
| import hypothesis as hp | |
| import pytest | |
| def merge(xs, ys): | |
| xs, ys = iter(xs), iter(ys) | |
| none = object() | |
| y = next(ys, none) | |
| if y is not none: | |
| while True: | |
| try: | |
| x = next(xs) | |
| if x > y: | |
| x, xs, y, ys = y, ys, x, xs | |
| yield x | |
| except StopIteration: | |
| yield y | |
| break | |
| else: | |
| ys = xs | |
| yield from ys | |
| @hp.given(st.lists(st.integers()), st.lists(st.integers())) | |
| def test_merge(xs, ys): | |
| merged = list(merge(sorted(xs), sorted(ys))) | |
| assert all(x <= y for x, y in zip(merged, merged[1:])) | |
| assert Counter(xs + ys) == Counter(merged) |
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